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My conclusion is that if the css for my Kobo H2O original uses other than ems for margins, (i.e. inches or points used), then there is about a 50% mismatch between point size of text and margin, i.e, approximately first line indent on body text will be 1/2 as many characters and also all other margins that are not main body are about 1/2, such as top margin before a heading or additional indent for a block of non-body text.
It's happened some time before 4.7 firmware, I think.
Simply leaving text point sizes alone and changing left indent (and left margin of non-body text) to official ems (point size / 12) works. Half size top margins or bottom margins on headings or other non-body text isn't an issue.
It's not a Calibre conversion issue. Happens on other sources not using "ems". Obvious when comparing to other apps, Sony or Binatone ePubs. Also Mobi on three generations of kindle are as expected (1.4em approx is same as 16pt & approx 3 characters of body text indent, but on Kobo the 16pt or 0.2" is about 1.5 characters indent, 1.4em is about correct)
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